private static Process p = new Process(); //FFmpeg进程

        public MainWindow()
        {
            InitializeComponent();

            //模拟对话
            factory.AddMessage("/Resources/headphoto.jpg", "张三", "2018-11-16 11:28:23", "大家好", MessageGrid);
            factory.AddMessage("/Resources/headphoto.jpg", "李四", "2018-11-16 11:28:23", "你好", MessageGrid);
            factory.AddMessage("/Resources/headphoto.jpg", "张三", "2018-11-16 11:28:23", "现在开始讲课,有要发言的同学吗?", MessageGrid);
            factory.AddMessage("/Resources/headphoto.jpg", "刘静杰", "2018-11-16 11:28:23", "老师你好我要发言,我的问题的这个测试长度看看是否是会自动增长的", MessageGrid);
            DiscussPanel.ScrollToBottom();



            var el1 = factory.GreateOnlineUser("/Resources/headphoto.jpg", "Lucy");
            var el2 = factory.GreateOnlineUser("/Resources/headphoto.jpg", "Dav");
            var el3 = factory.GreateOnlineUser("/Resources/headphoto.jpg", "Jerax");

            OnlieUsers.Children.Add(el1);
            OnlieUsers.Children.Add(el2);
            OnlieUsers.Children.Add(el3);
        }